Back digging shovel



April 5, 1932. M, L, FYKSE 1,852,156

BACK DIGGING SHOVEL Original Filed July 27, 1928 2 Sheets-Sheet l April 5, 1932.

M. L FYKsE BACK DIGGIG SHOVEL 2 Sheets-Sheet original Filed' lJuly 27', 192e @.JR. L m m M -A TTORNEYS.

.atented Apr. 5, 1932 MITCHELL L. nYKsE, oF soU'rH MILwAUKELnWIsCoNsIN, AssIGNoR To BUGYRUS- ERIE COMPANY, OF SOUTH MILWAUKEE, WISCONSIN, A CORPORATION DELA.-

l 'WARE BACK DIGGING SHO'VEL Original application led July 27, 1928, Serial No. 295,661. Divided and this application led May 3,.

f i 1929. Serial No. 360,089.

My invention relates to new and useful improvements in back digging shovels.

`This application is a divisional of my copending application, Serial No. 295,661, filed July 27, 1928.

Back digging shovels are well known in the excavating art. They are characterized' by a dipper mounted on the lower end of a handle, which is pivoted intermediate its ends onthe outer end of the boom, the inner end of the boom being pivoted to the frame yof the machine. `The shovelfaces toward the machine. On the main frame of the machine isa two-drum winch, from which one rope, associated with the dipper, tends to drag the dipper toward the machine. The other rope of the winch is associated with the upper end of the dipper handle and tends bothto raise the boom and to cause the dipper to move away from the machine.

The principalrobj ect of my invention is toprovide a novelswivel for the dipper handle.

Further objects and advantages of my invention will be readily evident, as the description progresses. l

- VThe invention consists in the novel parts,

and in the combinations and arrangements thereof, which are definedl in the appended claims and of which one embodiment is exem- -plied in the accompanying drawings, which are hereinafterV particularly described and explained.

Throughout the description, the same reference number is applied to the same member i or to similar members. l

Figure 1 is a side elevation of a power shovel embodying my invention.

Figure 2 is a rear elevation of the dipper handle A and associated parts, viewed from line l 2-2 of Figure 1.

Figure 3 is a partial elevation of the dipper handle, similar to Figure 2, butshowing an alternative form. f

' Referring to the drawings,it will be seen i that 5 is themain base of the power shovel,

supporting the boom 6,.the A-frame 7, and the main winch 8.

The main winch 8 includes two hoist drums 9 and 10, actuable by any convenient power D source (not shown).

On the outer end of boom 6 is a hinge pin 11', which serves as a horizontal pivot for the handle 12. Hinged to the boom by the hinge pin 11 is a swivel piece 13 providedV witha swivel axle 111 which extends through a bushed hole in the handle 12. i r

The swiv-eling of the handle is limited by two arms 15, and associated devices shown in detail inv Figure 2. To each of these arms, at 16, is pivoted a bolt 17, whichis free to '60 reciprocate in hole 18 in the handle 12. Nuts 19 near the top of the bolt 17 bear against a plate20, which in turn bears against a compression spring 21, which in y turn bears against a block 22, which in turn bears against the handle 12. The spring 21 is surrounded and protected by a cylinder 23.

The two springs tend to limi-tthe swiveling of the handle and to restore itto its normal vertical position. x t

In the variant of this device shown in Figure 3, the two arms 15 bump against wooden bumper blocks2t projecting from the ends of cylinder 23', which are secured to the hani dle 12 by bolts 17 and nuts 25. 75

A spring bumper 26 is provided on the top of the outer end of the boom 6 to contact with bumper plate 27 of the handle 12 whenever the handle is in its most extended position.

On the upper end of the handle are two hoist sheaves 28, and on a bracket29 in the lower end of the-handle is a padlock sheave 30.

A digging dipper 31 is held by the lower end of the handle 12 and by a brace 32. 1 85 A rope 37 passes from an anchorage 34: on the boom 6, around the padlock sheave 30, 1 thence through. the 'boom and between twor guide sheaves 38 on the A-frame 7, tothe A drum V9 of the main vwinch 8'. A rope39is 'f90 anchored in a rope socket 4:0 whichiis pivoted to the apexV ofthe A-frame 7. This rope then passes around one of the hoist sheaves 28,. thence around one Vof the sheaves 41. at the apex of the A-frame,.thence around the other *g5 hoist sheave 128, thence around the. other sheave l1 at the apexrof the A-frame, and

thence to the Vdrum 10 0f the main winchrS. Digging is accomplished by pullinginron rope 37, the exact height of digging being va- :ma i

spot, dumping is effected by pulling-in onl rgpe 39 and simultaneously paying out rope Although swivels for dipper handles of back digging shovels are old in the art,and have even beenarranged so as to swing in a plane retherthan'in a 6.01.16, and lfurtlieranire have even been provided with stops to Vlimit the swingingfrom side to sida-*these stops have'fnever been suliciently Wide spaced nor sufiiiciently resilient` to `eliminate jar and breakage. vrMy invention eliminates these difliculties.

vHavi-n'g now `described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited oted at its lower end to the frame,

to the speciic form or arrangement of parts hereinbefore described, except insofar Vas such limitations are specified in the appended claims.

il. vIn a machine of the class described, the combination of: a main .frame ;-V a boom, pivotedat its .lower end to the frame, for swing-` ing in a vertical plane about its pivot; amember, pivoted'to, the outer end of the boom, forsivinging in a vertical plane about its pivot ,a dipper handle, pivoted intermediate its ends to said member, for Swingin@ about said member laterally in a plane ;a l-i-gging dippermountedv on the lower end of said handle ;v means extending substantially wide'- jlybeyond the width of said handle for limiting this lateral swinging; and means for swinging said booml and said handle, to per- Yform' the digging` operations.

2, a machine of the class described, thek combination of:- a main frame ;Y a boem, pivo'tedlat its lewerend to the frame, for swing- 'ing in a vertical plane about its pivot a member, -pivoted tothe -outer'end of the boom, for swinging in a vertical plane about its pivot 'a dipper handle, pivote'd intermediate its ends to 4said member, for swinging about said `member laterally in a plane; a digging dippermounted on the lower end of said handle;v means for limiting this lateral swinging and for positively returning the handle "t'o the same vertical plane with the boom; and means for swinging said yboom V"and said handle, to perform lthe digging operations. Y

' Inja machine lof the classdescribed, the combi-nation of: a main frame; a boom, pivforswingM ing vertical plane about its pivot; a member, pivote'dv to the outer end of the boom, for

swinging in vertical plane about itspivot;

a Vdippe'r handle, pivoted intermediate its ends to said member, for swinging about said member laterally in a plane; a digging dipper mountedl on the lower end of'said handle; spring means for limiting this lateral swinging; and means for swinging said ybeon and said handle,lto perform the ydiggingfoperations.

4. In a machine of the class described,the combination of: a main frame.; a boem, piv-v oted at its lower end to the `frame, -`forfstngingin a vertical plane about its pivot; a 'member, pivot'ed to the outerv end of the boom, for swinging in a vertical planeabout its pivot;

ya dipper handle, pivoted intermediate Aits ends to said member, for swinging about said member laterallyiin a pla-nefgalfdiggi dipper mounted fen .the lewertendzosaid handle; spring means for limitingfthisr lateral swinging and forl positively 'retnrnngff'the handle to the same vertical plane with'the "bozolinl, and means for swinging .said Yboem and said handle, -to performV the, 'digging Qperations:

v5. In' a machine of Ythe.class described, the combinationl of.: :a main frame; a boom, pre1` oted at its lower fend tothel frame, for swinging in a verticalplaneabout itsqoivot armeni@ ber, pivoted I,tethe 'outerfend fof the-boom, for swinging in a vertical plane about itspivotf; a Vdipper handle, pivoted intermediate its ends to said member, for swinging abolatlsaid memberV laterally in la plana; a digging dip: per mounted `'on'th'e lower-end of saidha'ndlfeg; means projecting laterally 'from both lpiv' oted member Vand handle, for limiting this lateral swinging andy for-'pesitivelyretumf ing the handle to the same; vertical plane with the boom gand meansxton-swinging-said boom Aand said handle, te perrorm the digging operations; y

6. In a machine of. the classrdescribedfthev" combination ofi: a main iframe; afbeem, pivoted at its Ilower endto.' thefframe,.zfbr :swing ing .in a vertical :plane about. lits pivot;- 58, member, Ypivoted to the outer eu'dsofr thefboom,

for lswinging* in yavertie-ailplanes abontits pivotgaa kclipper handle,- pivoted intermediate its ends to said member, for swinging-'about vsaid member 'laterally fin j aiV plane la. digging dipper mounted en therloiwer fend fof 'said handle; spring means,forwlimitingwthisflats eral swinging and tor `retin-*ning 'thehandle to the same vertical plane with the said spring means. consisting in twoJ springs carriediby ythe, handle and'beallangrespeist/iter ly against( lateral projectionsV from the f piittl ot'ed member;y and' .forfswingingfaid boom and Vsaidf handle, 'to .perifbrln the adigging operations. v i, l.. 1 Inf-testimony'whereofI'faxmy -ture. 

